Martin's son, Corporal Billy Martin of the Arkansas State Police, answered his father's "10-7," code for "out of service," and "10-42," code for "ending tour of duty." The Arkansas State Police posted video of the exchange on their Facebook page.

Roy Martin had no idea his son would be on the other end of the call, State Police said. He retired after 31 years of service, according to KFSM.

After Roy Martin made his call, his son immediate took to the radio.

"Attention all units," Billy Martin said. "It is a great pleasure to announce, after 31 years of dedicated service, my dad, Cpl. Roy Martin, of the Arkansas Highway Police, Badge No. 420, is retiring and given his final 10-7."